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In theory they should be cleaned annually to remove any parasites, but I must admit that I have some that can't be reached very easily. Since not all the boxes are used every year, I don't worry about it.
Sounds like you have an insect infestation of some kind. Spray thoroughly with Provado Ultimate Bug Killer and don't eat the leaves for six weeks afterwards.
They need to be watered, but only lightly. Keep them barely damp, never wet.
It depends entirely on their position. If it is windy and exposed and you want a straight tree, you need to stake them.
By contrast, I've never had any problem with rot in an airy garage, but I have lost them through drying out. As Geoff says, they never dry out in the ground.
Don't - dahlias can dry up and die if they get too dry.
And I third that - conifers really should be left alone. A neighbour decided to prune some of theirs, and they looked so dreadful that they got rid of them entirely a couple of years later.
It's getting a bit late for some bulbs but you can certainly still plant daffodils and crocus, and tulips next month. Avoid snowdrops, though - they will have dried out out of the ground and probably won't grow.
Do be careful that your fence is strong enough before trying to extend it - the extra trellis, combined with climbers, will be heavy.
That must be a labour of love, Caz!
Jean, some of my violets are still flowering too, though not as well as yours.